Realistic marine wildlife photography of a sea otter floating on calm kelp forest water, holding a smooth shell on its chest, with wet fur texture, visible whiskers and bright eyes. Kelp leaves surround the body, and the animal behavior feels natural. Landscape 4:3 low water-level view, soft ocean background in gray blue tones, no boats, docks or human-made objects. Overcast coastal daylight, gentle reflections, realistic water ripples and detailed fur, calm marine atmosphere, no logos, no readable text, no watermark, no fantasy colors, no anthropomorphic expression.